I'll admit it, I was very skeptical about buying this - I thought there was a very good chance that I was wasting £40.
I had read the reviews on here, there were a couple of people commenting that it hadn't worked with their Jack Russells, and that concerned me - we have two collies and one Jack Russell.
The problem was that the two younger dogs were very 'yappy' - if my wife left the house in the morning, the dogs would bark and yap until I had to get out of bed and shout at them. I'd go back to bed, and a minute later they were at it again.
I'd arrive home, pull up on the drive and they would start barking - it was getting beyond a joke.
So, I bought one of these, filled it up, put it around the terrier's neck and waited....
I was at work most of the following day, when I came home there was silence - I spoke to my wife who says that she swapped the collar onto the young Collie when she came home from work (it recommends that they don't wear it for more than eight hours at a time), and we haven't heard a peep out of them since!
I have to say that I am amazed - I really didn't think this would work, but it has - 100%. Sure, the dogs still play up, are still a little manic, but they don't bark any more, which means I no longer get dirty looks from the neighbours.
I'm impressed, really impressed, and would now recommend this collar to anyone who has a barking dog problem.
I wish I had bought one of these years ago.